TUDCA and GLP-1 Drugs: What to Know About Your Gallbladder

GLP-1 weight-loss and diabetes medicines such as Wegovy, Ozempic, Zepbound and Mounjaro carry gallbladder warnings on their labels, and in trials gallbladder problems were somewhat more common than on placebo, though still uncommon. We found no study in people of TUDCA taken with semaglutide or tirzepatide, so no one knows whether TUDCA changes that risk.

---

Many people starting a GLP-1 medicine first hear about the gallbladder when they read the label. Some look at supplements such as TUDCA, hoping to protect their gallbladder, and many people in online forums ask whether it helps.

This guide sets out what the labels and trials say about GLP-1 drugs and the gallbladder, in exact numbers, why the problem happens, what prevention evidence exists, and what is and isn't known about TUDCA. It also covers taking these medicines after gallbladder removal.

Can GLP-1 Drugs Affect Your Gallbladder?

Yes. Each of four widely prescribed GLP-1 medicines warns about gallbladder disease on its US label, and the rates in the trials were higher than on placebo. Each label gives its own figures from its own trials, so they can't be compared across drugs.

Medicine	Main use in the trials	Gallbladder problems in the label's trials
Wegovy (semaglutide) [1]	Weight reduction	Gallstones 1.6% vs 0.7% on placebo (injection); inflamed gallbladder 0.6% vs 0.2%
Ozempic (semaglutide) [2]	Type 2 diabetes	Gallstones 1.5% on 0.5 mg and 0.4% on 1 mg; none on placebo
Zepbound (tirzepatide) [3]	Weight reduction	Gallstones 1.1% vs 1%; inflamed gallbladder 0.7% vs 0.2%; gallbladder removal 0.2% vs none
Mounjaro (tirzepatide) [4]	Type 2 diabetes	Gallstones, gallbladder pain or gallbladder removal combined: 0.6% vs 0%

The Wegovy label adds that gallbladder problems were more common on the drug than on placebo "even after accounting for the degree of weight loss", and that they can happen without substantial or rapid weight loss [1]. The Zepbound label says the gallbladder events were associated with weight reduction [3].

How Common Are Gallbladder Issues on GLP-1 Drugs?

Gallbladder problems are uncommon on these drugs, but more common than without them. A 2022 analysis of 76 trials found gallbladder and bile duct problems about 37% more often on GLP-1 drugs than on comparison treatments, and about 2.3 times as often in the trials for weight loss [5]. The risk was higher at higher doses and with longer use [5].

Those are relative figures. In absolute terms, the same analysis worked out about 27 extra cases for every 10,000 people treated for a year [5]. The analysis gave no separate absolute figure for the weight-loss trials. A 2025 analysis of placebo-controlled trials found about 2 extra cases of gallstones per 1,000 people [6]. The 2022 analysis included no tirzepatide trials; a later analysis of tirzepatide trials also found more gallbladder and bile duct problems than on comparison treatments [7].

Why Do GLP-1 Drugs Cause Gallbladder Problems?

Losing weight quickly is one reason. When you lose weight quickly, your liver releases extra cholesterol into bile, and fast weight loss can also keep the gallbladder from emptying properly [8]. Both make gallstones more likely. A 1995 analysis of very low-calorie diet studies in people with obesity found the risk climbing steeply when people lost more than about 3 lb (1.5 kg) a week [9].

Weight loss isn't the whole story, because the Wegovy label found more gallbladder problems even after accounting for weight loss [1]. The label doesn't say why.

How Can You Protect Your Gallbladder on a GLP-1 Drug?

No approach has been tested specifically in people on GLP-1 drugs. What is known comes from other kinds of weight loss. NIDDK says losing weight at a slower pace may make gallstones less likely, and suggests 5 to 10% of starting weight over six months [8]. Fat in the diet may matter too: in very low-calorie diet trials, diets with more fat were linked to fewer gallstones than very low-fat versions [10].

The medicine with the most prevention evidence is ursodiol, a long-established prescription medicine. In 14 trials of people after weight-loss surgery, a group that loses weight very quickly, gallstones formed in 8.3% of those on ursodiol and 38.1% of those without it [11], though the largest trial missed its main goal [12]. NIDDK notes it can help prevent gallstones in people losing weight rapidly through very low-calorie diets or surgery [8]. We found no trial of ursodiol in people on GLP-1 drugs. Being offered ursodiol is common, and whether it suits you is decided with your prescriber.

Does TUDCA Protect Your Gallbladder on a GLP-1 Drug?

We found no study in people of TUDCA taken with semaglutide or tirzepatide, and no study of whether TUDCA changes gallbladder risk on any GLP-1 medicine. The only report we found of TUDCA alongside a GLP-1 drug was a single case of a rare genetic form of diabetes, which recorded no gallbladder outcomes [13]. TUDCA has also not been shown to prevent gallstones in people, and in the one trial comparing it with ursodiol for dissolving stones, ursodiol did better [14]. Our guide to TUDCA and gallstones sets out those studies.

Does TUDCA act like a GLP-1 drug?

No. The idea comes from cell and mouse studies of a bile acid receptor [15], and we found no study in people that measured GLP-1 after TUDCA [16]. Our guide to TUDCA and weight loss covers the human studies.

Can You Take TUDCA With a GLP-1 Drug?

We found no interaction study, and the TUDCA medicine labels don't mention GLP-1 drugs [17]. The labels do say not to take TUDCA with frequent gallbladder attacks, an inflamed gallbladder or bile ducts, or a blocked bile duct [17], which overlap with the problems GLP-1 labels warn about. If you have gallstones or gallbladder symptoms, that makes it a question to settle with your prescriber first. Our guide to who should not take TUDCA covers every caution on the labels.

What Are the Signs of a Gallbladder Problem?

Gallbladder attacks usually cause pain in the upper right abdomen, sometimes lasting several hours, often after heavy meals [18].

See a doctor right away for upper abdominal pain lasting several hours, nausea and vomiting, fever or chills, yellowing of the skin or eyes, or tea-colored urine and light-colored stools [18]. The GLP-1 labels also tell patients to contact their health care provider if they think they have gallbladder problems, and nausea is a common side effect of these drugs, so mention new or severe stomach symptoms to your prescriber too [1, 3].

Can You Take GLP-1 Drugs Without a Gallbladder?

None of the four labels lists gallbladder removal as a reason not to take these drugs [1, 2, 3, 4]. We found no study of their side effects in people who have already had their gallbladder removed, only a single case report of a man who continued one after surgery [19]. Your body's own GLP-1 response to a meal was preserved after gallbladder removal in one small study, but that study looked at the natural hormone, not the drugs [20].

Without a gallbladder, bile flows directly from the liver into the small intestine instead of being stored for meals [21]. Dr.Primal's TUDCA is made for life after gallbladder removal and taken with meals, to support healthy bile flow and fat digestion when richer meals feel heavy. Our guide to weight gain after gallbladder removal covers what is known about weight after surgery.

In Summary: TUDCA and GLP-1 Drugs

GLP-1 drugs carry gallbladder warnings, and in trials gallbladder problems were more common than on placebo, though the absolute increase was small. Slower weight loss may lower gallstone risk, and the prevention trials tested ursodiol, mostly after weight-loss surgery; we found no study in people of TUDCA with semaglutide or tirzepatide, so it can't be counted on to protect your gallbladder.

If you are working out what is behind your symptoms after meals, our digestion quiz is a quick way to put your symptoms and habits in order.

This article is for general education and is not a substitute for advice from your doctor. TUDCA is sold as a dietary supplement. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.